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Derivative Instruments (Details) € in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 24 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2011 USD ($) instrument | Mar. 31, 2018 EUR (€)
Derivative [Line Items] |  |  |  |  |  |  |
Amortization of interest expense |  |  |  | $ 1,013,000 | $ 998,000 |  |
Amount to be recognized from hedged transactions within 12 months, approximate |  |  |  | $ 6,200,000 |  |  |
Foreign currency transaction gain |  | $ 0 |  |  |  |  |
Switzerland |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Stamp duty expense | $ 2,200,000 |  |  |  |  |  |
Other (Income) Expense Net |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Foreign currency transaction loss |  |  | $ 0 |  | 900,000 |  |
4.20% Senior Notes, due December 2021 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  | 4.20% |
4.50% Senior Notes, due December 2020 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  | 4.50% |
Interest Rate Contract |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of instruments held | instrument |  |  |  |  |  | 2 |
Interest Rate Exchange Agreement Expiring 2010 and 2011 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Amortization of interest expense |  |  |  |  |  | $ 68,900,000 |
Term of amortized interest expense, years |  |  |  |  |  | 10 years |
Foreign currency exchange contracts |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, notional amount | € |  |  |  |  |  |  | € 180
Cash received from settlement of contracts |  |  |  |  | 6,600,000 |  |
Foreign currency exchange contracts | Other (Income) Expense Net |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Gain (loss) on derivatives |  |  | $ 0 |  | $ 900,000 |  |

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